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Process for producing light olefins

a technology of light olefins and process steps, which is applied in the direction of hydrocarbon preparation catalysts, chemical production, organic chemistry, etc., can solve the problems of complex and complicated catalyst replacement and regeneration, poor heat transfer effect, and fixed bed reactors, so as to maintain the yield of light olefins, increase the volume space velocity of alkane feedstocks, and increase reaction pressure

Active Publication Date: 2018-12-04
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a new process for producing light olefins that has several benefits compared to existing methods. The process has a high production capability, can be used to build smaller and less expensive production plants, and has a simpler operation and design. It also ensures the safety of the production process and plant. Overall, this process is a new-generation solution for producing light olefins.

Problems solved by technology

The fixed bed reactor has the disadvantage of the heat transfer effect being poor, the catalyst replacement and regeneration being complex and complicated, the continuous reaction being difficulty conducted, and the like, and the advantage of being capable of achieving a large throughput of an alkane feedstock.
Obviously, this will accordingly increase the investment and maintenance cost of the plant.
If the reactor and the regenerator are not well segregated, there will be a large potential safety hazard.
Therefore, it is inevitable for the catalyst natural loss during the production, in particular in case that the catalyst fine powder having a particle size of less than 20 microns becomes more and more in the catalyst.
This will have a detrimental effect on the subsequent product separation, and will be adverse for the catalyst to be reused.

Method used

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  • Process for producing light olefins
  • Process for producing light olefins
  • Process for producing light olefins

Examples

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example

[0077]Hereinafter, the specific embodiments of the present invention will be discussed in details with reference to the drawings.

[0078]The device used in Example was a pressurized fluidized bed device, which was similar to those shown in the drawings so as to accomplish the similar reaction and regeneration effects.

[0079]The catalysts used in Examples 1-12 and Comparative Examples 1-10 were the prepared catalysts, being a Cr—Fe—K / Al2O3 catalyst. The Cr—Fe—K / Al2O3 catalyst (hereinafter referred to as chromium-type catalyst) was prepared as follows: Firstly, 780 g of chromic nitrate (analytically pure), 100 g of ferric nitrate (analytically pure), and 80 g of potassium nitrate (analytically pure) were charged as solid to a vertical agitation tank containing 3000 g of distilled water, and the resulting mixture was stirred for 1 h; Then, 2000 g of a pre-dried γ-Al2O3 was charged to the vertical agitation tank, and the resulting mixture was adequately stirred and impregnated for 2 h; The...

examples 1-6

[0080]Examples 1-6 were conducted according to the process as shown in FIG. 1, the used feedstock was propane (purity=99.5% or higher), and the above Cr—Fe—K / Al2O3 dehydrogenation catalyst was used. The experiment condition, the feedstock amount, and the yield and output of light olefins were listed in Table 1.

examples 7-12

[0082]Examples 7-12 were conducted according to the process as shown in FIG. 1, the used feedstock was isobutane (purity=99.5% or higher), and the above Cr—Fe—K / Al2O3 dehydrogenation catalyst was used. The experiment condition, the feedstock amount, and the yield and output of light olefins were listed in Table 2.

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Abstract

Disclosed is a process for producing light olefins. In the process for producing light olefins by continuously bringing an alkane feedstock and a catalyst into contact to subject to a dehydrogenation reaction, the reaction pressure P of the dehydrogenation reaction is made 0.6-2 MPa and the volume space velocity H of the dehydrogenation reaction is made 500-1000 h−1. The light olefins production process of the present invention is simple and continuous in operation and has the characteristics of low investment, significant increase in yield of light olefins and high safety.

Description

TECHNICAL FIELD[0001]The present invention relates to a process for producing light olefins from an alkane feedstock. Specifically, the present invention relates to a process for increasing the output of light olefins in a process for producing light olefins from an alkane feedstock.BACKGROUND OF THE INVENTION[0002]Lower olefins (C2-C4 olefins) are the fundamental starting materials for the organic chemical industry, and have an important role in the modern petroleum and chemical industry. As the production process, the technology of using an alkane feedstock to produce light olefins becomes more and more popular. At present, the reactor used in the technology of producing light olefins with an alkane feedstock mainly includes the fixed bed reactor and the fluidized bed reactor. The fixed bed reactor has the disadvantage of the heat transfer effect being poor, the catalyst replacement and regeneration being complex and complicated, the continuous reaction being difficulty conducted,...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C07C5/32C07C5/333C07C5/327C07C11/02
CPCC07C5/3335C07C5/333C07C5/3337C07C11/02C07C11/04C07C11/06C07C2521/04C07C2523/62C07C2523/86C07C2529/00Y02P20/52
Inventor WANG, XINYU, JINGCHUANLI, MINGGANGGONG, JIANHONGZONG, BAONINGXU, YOUHAO
Owner CHINA PETROCHEMICAL CORP